Incensed over Apple Inc.’s decision to stop paying it billions of dollars in licensing fees for smartphone chips, Qualcomm Inc. plans to retaliate by asking a U.S. trade agency to ban the imports of iPhones, according to a person familiar with the company’s strategy. Qualcomm is preparing to ask the International Trade Commission to stop the iPhone, which is built in Asia, from entering the country, threatening to block Apple’s iconic product from the American market in advance of its anticipated new model this fall, according to the person, who asked not to be identified because the discussions are private.

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